Folding trestle



y 9, 1950 SHAKOWITZ 2,506,896

FOLDING 'iRESTLE Filed Aug. 1, 1947 l2 Sheets-Sheet 1 I. SHAKOWITZFOLDING TRESTLE May 9, 1950 2 Sheets-Sheet 2 Filed Aug. 1, 1947 [5 221 0Te SfiuZa W272 Patented May 9, 1950 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to folding or collapsible trestles.

An object of this invention is to provide an improved trestle which isnot only collapsible, but is also readily adjustable as to height.

Another object of this invention is to provide a trestle wherein eachleg is formed of telescoping parts adapted to be adjusted endwise so asto support the top bar at a predetermined height.

A further object of this invention is to provide a collapsible trestleformed of a top bar, a pair of downwardly divergent legs and a, bracingbar between the legs, the legs being extensible so that the top bar willbe maintained in horizontal position and at a predetermined height.

With the above and other objects in view, my invention consists in thearrangement, combination and details of construction disclosed in thedrawings and specification, and then more particularly pointed out inthe appended claim.

In the drawings,

Figure 1 is a detail side elevation of a collapsible and extensibletrestle constructed according to an embodiment of this invention,

Figure 2 is a sectional view taken on the line 2-2 of Figure 1,

Figure 3 is a fragmentary sectional view taken on the line 3-3 of Figure1,

Figure 4 is a fragmentary sectional view taken on the line 44 of Figure1,

Figure 5 is a plan view of the trestle in substantially collapsedposition,

Figure 6 is a detail inner side elevation of one of the supporting legs,

Figure 7 is a fragmentary side elevation of the upper supporting bar,

Figure 8 is a fragmentary side elevation of the upper bar at the endopposite from the end shown in Figure '7.

Referring to the drawings, the numeral I designates generally an upperhorizontal bar which is supported by means of two pairs of legsgenerally designated as II. The upper bar I0, adjaoent one end thereof,is. formed with a recess or notch I2 which is inclined to the verticalwithin which the upper end of an upper leg member I4 is adapted to bedetachably secured.

A bolt I3 is adapted to engage through the upper ends of the legs II andthrough an opening I formed in the upper bar I0. The upper bar ID, asshown in Figure 2, is of substantially V-shape in transverse section sothat the legs II will be disposed in downwardly divergent relation. Theupper bar I0, adjacent the opposite end thereof is formed, as shown inFigure 8, with a recess I6 on each side thereof, and the bar I0 is alsoformed with an L-shaped slot I'I within which the upper securing bolt I3is adapted to removably engage.

Each leg II includes an upper bar I4 and a lower tubular leg bar I8which is split as indicated at I9 on the inner wall '20 thereof. Theupper leg bar I4 is formed with a plurality of holes 2| spaced apartlengthwise of the upper bar or leg member I l, and the tubular legmember I8 is also formed with a plurality of spaced apart openings 22.

A bolt 23 is adapted to engage through registering openings 2! and 22and is secured in adjusted position by means of wing nut 24. A bracingbar 25 connects the leg members of the two pairs together and thebracing bars 25 are secured to the leg members II by means of bolts 26passing through registering openings 2| and 22 of the leg members I Iand I8, and. wing nuts 21 are threaded onto the bolts 26.

When the trestle hereinbefore described is in operative position, theleg members of each pair are disposed in downwardly divergent relation,as shown in Figure 1, being braced by the two bracing bars 25. The upperbar III may be raised to the desired height by moving the tubular legmember I8 lengthwise of the upper leg member I4. The two leg members I4and I8 are securely bolted together by the bolts 23, and also by thebolts 26.

In the collapsing of the trestle, the bolts I 3 and 26 are loosened andthe bolt I3 engaging in the L-shaped slot I! may be moved outwardly ofthis slot so that the upper bar III may be swung downwardly between onepair of leg members I I. The other pair of leg members I I may be swungdownwardly and inwardly from their upper ends, as shown in Figure 5. Theleg members II in the collapsed position of the trestle will be disposedclosely adjacent each other, the leg members and other related partsshown in Figure 5 being shown somewhat spaced apart for facility ofreference.

The upper bar III can be applied to any industry by merely changing thedimensions of the bar and to suit the particular purpose of theparticular mechanic.

I do not mean to confine myself to the exact details of constructionherein disclosed, but claim all variations falling within the purview ofthe appended claim.

What I claim is:

A collapsible trestle comprising an upper horizontal bar, a first pairof recesses formed in the opposite sides of said bar adjacent one endthereof, a pair of supporting legs positioned at the upper ends thereofwithin said first pair of recesses, releasable clamping means securingsaid legs in said recesses, a second pair of recesses formed in theopposite sides of said bar adjacent the other end thereof, downwardlyopening L- shaped slot formed in said bar within the area of said secondpair of recesses, a second pair of supporting legs, second clampingmeans including a transverse member engageable in the transverse leg ofsaid slot and extending through the upper ends of said second pair oflegs adapted to secure said second pair of legs within said second pairof recesses whereby exertion of lateral pressure on said second clampingmeans precludes downward movement of said second pair of legs and saidsecond pair of recesses preclude lateral REFERENCES CITED The followingreferences are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 249,508 Douns Nov. 15, 1881843,118 Struble Feb. 5, 1907 1,226,112 Pepin et a1 May 15, 19171,575,691 Klee Mar. 9, 1926

